Promises

Developer
Steven
Size
2,516 Kb
Views
24,288
  1. Promises Previews
  2. Promises HTML Codes
  3. Promises JS Codes

How do I make an promises?

What is a promises? How do you make a promises? This script and codes were developed by Steven on 07 December 2022, Wednesday.

Promises Previews
IQ Test

Promises - Script Codes HTML Codes

<!DOCTYPE html>
<html >
<head> <meta charset="UTF-8"> <title>Promises</title>
</head>
<body> <script src="js/index.js"></script>
</body>
</html>

Promises - Script Codes JS Codes

"use strict";
var addToBody = function addToBody(thing) { return document.body.innerHTML += thing + "<br>";
};
var addToConsole = function addToConsole(thing) { return console.log(thing);
};
// No promises (console log)
// Chaining functions that return later.
// Just calling them all at once will cause the total time
// To be 5000ms. And the output would be backwards
// Callback hell. Much nesting.
setTimeout(function () { addToConsole("FIRST after 5000ms"); setTimeout(function () { addToConsole("SECOND after another 4000ms"); setTimeout(function () { addToConsole("THIRD after another 3000ms"); setTimeout(function () { addToConsole("FOURTH after another 2000ms"); setTimeout(function () { addToConsole("FIFTH after another 1000ms"); }, 1000); }, 2000); }, 3000); }, 4000);
}, 5000);
// Promise Examples
var firstThing = function firstThing() { return new Promise(function (resolve, reject) { setTimeout(function () { return resolve(addToBody("FIRST after 5000ms")); }, 5000); });
};
var secondThing = function secondThing() { return new Promise(function (resolve, reject) { setTimeout(function () { return resolve(addToBody("SECOND after another 4000ms")); }, 4000); });
};
var thirdThing = function thirdThing() { return new Promise(function (resolve, reject) { setTimeout(function () { return resolve(addToBody("THIRD after another 3000ms")); }, 3000); });
};
var fourthThing = function fourthThing() { return new Promise(function (resolve, reject) { setTimeout(function () { return resolve(addToBody("FOURTH after another 2000ms")); }, 2000); });
};
var fifthThing = function fifthThing() { return new Promise(function (resolve, reject) { setTimeout(function () { return resolve(addToBody("FIFTH after another 1000ms")); }, 1000); });
};
// Promise example (body output)
// Chained functions in a flatter way. No more nesting
// Intention obvious.
// Boom
firstThing().then(secondThing).then(thirdThing).then(fourthThing).then(fifthThing);
Promises - Script Codes
Promises - Script Codes
Home Page Home
Developer Steven
Username volv
Uploaded December 07, 2022
Rating 3
Size 2,516 Kb
Views 24,288
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